The performance of the Mirage 2000-5, which won even without AESA, was very surprising to many people. Therefore, the Taiwanese Air Force cannot easily abandon the Mirage 2000-5.
They should definitely upgrade the EW suite to ICMS Mk4 while preparing to replace the fleet with Rafale. And they should retain the twin-seats for the long term via a SLEP program.
They are supposed to make a decision by July this year, right?